Start with up to five repetitions, as long as you're able to maintain good form. Over time, as you strengthen your abs and core muscles, gradually increase to 10 to 15 repetitions on the fitness ball. Remember to breathe freely and deeply while using the fitness ball.

Hillary Clinton's office said "nothing nefarious was at play" when the former secretary of state used her personal email address, rather than one provided by the State Department, during her four years as America's top diplomat.